Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
96% | 4% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
96% | 4% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 36°C | 96% |
| 37°C | 4% |
| 38°C | 1% |
| 31°C or below | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 39°C | 0% |
| 40°C | 0% |
| 41°C or higher | 0% |
Market context
The key real-world event is whether temperatures at Incheon International Airport near Seoul reach a summer peak high enough to clear the market’s band on 8 August. August is normally Seoul’s hottest month, with average highs around 29.5-30.5°C and humid conditions, so a mid-30s reading is not unusual; one August 8 reference point shows a 36.0°C record high, while current forecasts are already clustering in the mid-30s Celsius rather than the low 30s.[1][2][11]
A 0% YES price makes sense only if traders are assuming the upper bands are out of reach, but comparable summer histories suggest the market can still move quickly on a single hot afternoon. Recent historical and forecast pages point to a high around 34.6°C for Seoul on 8 August, and recent daily data show temperatures near 30°C already, which keeps the upside scenario alive if sunshine and weak mixing continue through the afternoon.[1][3][12] The main reference point remains the Daily Observations table from Weather Underground, not the summary high/low, so traders should watch the station-specific readings rather than broader city forecasts.[4][15]
Catalysts are straightforward: the day’s hourly observations, any late-morning update to the airport forecast, and whether cloud cover or showers suppress the afternoon maximum. Weather Underground’s station history for the Seoul area and nearby airport stations is the resolution source, so the most relevant dependency is the observed temperature trajectory at Incheon Intl Airport rather than general Seoul weather pages.[4][15]
Methodology
Sports-specific comparison page for Highest temperature in Seoul (Incheon) on August 8?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
UK Frequently Asked Questions
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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